Rosetta&#39;s Comet Surprise

In an astronomical first, scientists have discovered molecular oxygen in the Rosetta comet&#39;s atmosphere. And it may be a relic from the birth of the Solar System. The discovery marks the first time astronomers have detected molecular oxygen in the cloud of dust and gas surrounding a comet.
http://gizmodo.com/theres-primordial-oxygen-leaking-from-rosettas-comet-1739333271
#tech